Since you're a Windows user, you can choose between XnView “Classic” and MP (Multi Platform).
While the Classic edition is only available as a 32-bit application, MP 64-bit is able to benefit from the advantages of modern hardware and operating systems, resulting in increased perfomance (64-bit computing). Another major advantage of MP is it's native support for Unicode.

I don't think you'll be disappointed with any version of XnView. However, which version is better for you personally largely depends on what your requirements are: organizing, viewing, editing, batch conversion, …

XnTriq wrote:
I don't think you'll be disappointed with any version of XnView. However, which version is better for you personally largely depends on what your requirements are: organizing, viewing, editing, batch conversion, …

Thanks for the reply

I know I had both classic and MP on my old PC and I remember that one had more options (one I used) that the other but I can't remember what those options were. I will be taking some photos soon (nonprofessional for a youth organization, no charge of course) and I know I will be tweaking them I just wish I could remember which one I used. I guess I'll have to try them both. I will say when I saw the "List of features not in XnViewMP" I automatically thought "oh I don't want to lose functionality ... "